84909021 has 8 divisors (see below), whose sum is σ = 115348320. Its totient is φ = 55537872.

The previous prime is 84909017. The next prime is 84909023. The reversal of 84909021 is 12090948.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84909021 - 2² = 84909017 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84909023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266851 + ... + 267168.

It is an arithmetic number, because the mean of its divisors is an integer number (14418540).

Almost surely, 2^84909021 is an apocalyptic number.

It is an amenable number.

84909021 is a deficient number, since it is larger than the sum of its proper divisors (30439299).

84909021 is a wasteful number, since it uses less digits than its factorization.

84909021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534075.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 84909021 is about 9214.6091072818. The cubic root of 84909021 is about 439.5260409528.

Adding to 84909021 its reverse (12090948), we get a palindrome (96999969).

The spelling of 84909021 in words is "eighty-four million, nine hundred nine thousand, twenty-one".